echo "请输入性别[g|G|b|B]"
read gender
case $gender in
    "g") echo "She is a girl"
    ;;
    "G") echo "She is a girl"
    ;;
    "b") echo "He is a boy"
    ;;
    "B") echo "He is a boy"
    ;;
    *) echo "I don't know"
    ;;
esac
